72.

In order, therefore, that these three things--viz. asking, seeking, knocking--may be made clear, let us suppose, for example, the case of one weak in his limbs, who cannot walk: in the first place, he is to be healed and strengthened so as to be able to walk; and to this refers the expression He has used, "Ask." But what advantage is it that he is now able to walk, or even run, if he should go astray by devious paths? A second thing therefore is, that he should find the road that leads to the place at which he wishes to arrive; and when he has kept that road, and arrived at the very place where he wishes to dwell, if he find it closed, it will be of no use either that he has been able to walk, or that he has walked and arrived, unless it be opened to him; to this, therefore, the expression refers which has been used, "Knock."